Shielded discharge-type automotive head lamp

Details Shielded discharge-type automotive head lamp Shielded discharge-type automotive head lamp

1986-12-30

1988-12-27

Moore, David K.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Light valve or obscuring means

313489, H01J 516

Patent

active

047942975

ABSTRACT:
To provide light distribution required by legal and safety requirements for utomotive head lamps from a discharge lamp, a discharge vessel or bulb (2, 12) is retained within an outer bulb (7, 17), which outer bulb is made of hard glass and is coated at the outside with a visible light radiation absorbing coating (8, 18) directly applied to the outer bulb, and placed thereon to provide the desired light distribution. Thus, standard silicon iron oxide black can be used for the coating. Preferably, the inside of the outer bulb has a coating of infrared absorbing, visible light transmitting material applied thereto.

REFERENCES:
patent: 3234421 (1966-02-01), Reiling
patent: 3784861 (1974-01-01), Notelters et al.
patent: 4305015 (1981-12-01), Honda et al.
patent: 4305016 (1981-12-01), Schmidt
patent: 4479071 (1984-10-01), T'Jampens et al.
patent: 4594529 (1986-06-01), de Vrijer
patent: 4658177 (1987-04-01), Gosslar et al.

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